203 41 



XIV. In fdriiiing specific nanies, botanists will do well to note the foUowing reromniendations : 

 a) Avüid veiy long names and those which are difficiilt to pronounce. 



i) Avoid names which express a character common to all or nearly all the species of a genus. 



<-) Avoid names taken from little known or very restricted localities, unless the species 

 be very local. 



</) Avoid, in tlio saine genns, names which are very much alike, ospecially those which 

 differ only in their last letters. 



e) Adopt unpnblished names fonnd in travellers' notes and herbaria, attrilmting them to 

 the authors concerned, only when those concerned liave approved the publication. 



/") Avoid names which have been used before in the genus, or in any closely allied genus, 

 and which have lapsed into synonymy (homonyms). 



g-) Do not name a species after a person who bas neither discovered, nor described, nor 

 figured, nor in any way studied it. 



h) Avoid specific names formed of two words. 



;) Avoid names which have the same meaning as the generic name. 



Art. 27. Two species of the same genus caiinot bear the same specific, name. 

 but tiie same specific name may be given in several gênera. 



Example: Arabis spathulata DC. and Lepidhim spathulatum Phil, are valid as two names 

 of Crucifers; but Arabis spathulata Nutt. in Torr, and Gray cannot be maintained, on account of the 

 existence of Arabis spathulata DC, a name jirevionsly given to another valid s])ecies of Arabis. 



Art. 28. Names of subspecies and varieties are formed Hke specific names 

 and follow them in order, beginning with those of the highest rank. The same holds 

 for subvarieties, fornis, and slight or transient modifications of wild plants which 

 receive a name or numbers or letters to facilitate their arrangement. Use of a 

 binary nomenclature for subdivisions of species is not admissible. 



Examples : Andropogon ternatus subsp. macrothrix (not Andropogon macrothrix or Andropogon 

 ternatus subsp. A. macrothrix'); Herniaria hirsuta var. diandra (not Herniaria diandra or Herniaria 

 hirsuia var. H. diandra'); forma nantis, forma mamlatum. 



Recommendation. 



XV. üei'oniiiicndations made for specific names apply equally to n.imes of subdivisions of 

 species. These agrée with tlie generic name when they have an adjectival form ( Thymus Serpyllum 

 var. angustifolius, Ramiticulus acris subsp. Friesiamis). 



Ait. 29. Two subspecies of the same species cannot have the same name. 

 A given name can only be used once for a variety of a given sjjecies. even when 

 dealing with varieties which are classed undcr différent subspecies. The same holds 

 for subvarieties and forms. 



On the other hand the same name may be employed for subdivisions of 

 différent species, and the suljdivisions of any one species may bear the same name 

 as other species. 



Examples. — The following are admissible: Rosa Jtindzillii swc. leiocUida and Rosa glutitiosa 

 var. leioclada; Viola tricolor var. hirta, in spite of the existence already of a différent species named 

 Viola hirta. The following are incorrect: Erysimum hieraciifolium subsp. strictum var. longisiliqmtni 

 and E. hieraciifolium subsp. pannonicum var. longistbquum — a form of nomenclature which allows 

 two varieties bearing the same name in the same species. 



Recommendation. 



XVI. r.iitjuiists are recommended to use as little as possible the privilège granted in the 

 second part of article 29, in order to avoid confusion and niistakes and also to reduce to a minimum 



Verhandlungen des internationalen botanischen Kongresses. 1"* 



